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The Effects of Dynamic Transformation on the Formation of Pt-M (M = Ni, Fe) Nanocrystals

Published online by Cambridge University Press:  26 December 2018

Yiliang Luan ,
Can Li ,
Bo Zhao ,
Amar Kumbhar ,
Jun Zhang  and
Jiye Fang
Yiliang Luan
Affiliation:
Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, USA
Can Li
Affiliation:
Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, USA
Bo Zhao
Affiliation:
College of Arts & Sciences Microscopy, Texas Tech University, Lubbock, TX, USA
Amar Kumbhar
Affiliation:
Chapel Hill Analytical and Nanofabrication Laboratory, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
Jun Zhang
Affiliation:
College of Chemical Engineering, China University of Petroleum (East China), Shandong, China
Jiye Fang*
Affiliation:
Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, USA
*
*(Email: [email protected])
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Abstract

In the synthesis of metallic nanocrystals (NCs) using a high-temperature colloidal approach, the competition between deposition and diffusion of “free atom (or clusters)” plays an important role as it can direct the morphology of NCs during their evolution. This competition is closely associated with some dynamic conditions such as heat and mass transfer. Stirring speed and ramp rate of heating are two factors that greatly impact the heat and mass transfer processes and consequently determine the morphology of the products but rarely discussed in most synthetic protocols. Herein, we study the syntheses of Pt-M (M = Ni, Fe) NCs as model reactions, showing that a low stirring speed and high ramp rate of heating result in ununiform pod-like NCs, whereas the inverse conditions promote NCs in a uniform shape. This observation can be plausibly explained using a competition mechanism between the deposition and diffusion of the newly reduced atoms during a stage of the NC’s growth.

Keywords

chemical synthesiscrystal growthsolution deposition
Type
Articles
Information
MRS Advances , Volume 4 , Issue 24: Processing and Manufacturing , 2019 , pp. 1377 - 1382
Copyright
Copyright © Materials Research Society 2018 

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References

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